package com.changgou.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.changgou.search.pojo.SkuInfo;
import com.changgou.search.service.SearchService;
import org.apache.commons.lang.StringUtils;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.Operator;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.terms.StringTerms;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortBuilders;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.elasticsearch.core.ElasticsearchTemplate;
import org.springframework.data.elasticsearch.core.SearchResultMapper;
import org.springframework.data.elasticsearch.core.aggregation.AggregatedPage;
import org.springframework.data.elasticsearch.core.aggregation.impl.AggregatedPageImpl;
import org.springframework.data.elasticsearch.core.query.NativeSearchQueryBuilder;
import org.springframework.stereotype.Service;

import java.util.*;
import java.util.stream.Collectors;


@Service
public class SearchServiceImpl implements SearchService {

    @Autowired
    private ElasticsearchTemplate esTemplate;

    public final static Integer PAGE_SIZE = 20;


    @Override
    public Map search(Map<String, String> searchMap) {
        HashMap<String, Object> resultMap = new HashMap<>();

        //有条件才查询Es
        if(null != searchMap){
            //组合条件对象
            BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
            //name 是es中索引的字段， keywords是路径参数， operator 指定查询类型
            if(StringUtils.isNotEmpty(searchMap.get("keywords"))){
                boolQuery.must(QueryBuilders.matchQuery("name",
                        searchMap.get("keywords")).operator(Operator.AND));
            }
            //1：条件 品牌
            if(StringUtils.isNotEmpty(searchMap.get("brand"))){
                boolQuery.filter(QueryBuilders.termQuery("brandName",
                        searchMap.get("brand")));
            }
            //2:条件 规格
            for (String key : searchMap.keySet()){
                if (key.startsWith("spec_")){
                    String value = searchMap.get(key).replace("%2B", "+");
                    boolQuery.filter(QueryBuilders.termQuery("specMap." + key.substring(5) + ".keyword",value));
                }
            }
            //3:条件 价格
            if (StringUtils.isNotEmpty(searchMap.get("price"))){
                String[] p = searchMap.get("price").split("-");
                if(p.length ==2){
                    boolQuery.filter(QueryBuilders.rangeQuery("price").lte(p[1]));
                }
                boolQuery.filter(QueryBuilders.rangeQuery("price").gte(p[0]));

            }





            //4. 原生搜索实现类
            NativeSearchQueryBuilder nativeSearchQueryBuilder = new NativeSearchQueryBuilder();
            //boolQuery 查询条件对象
            nativeSearchQueryBuilder.withQuery(boolQuery);

            //5 高亮查询
            HighlightBuilder.Field field = new HighlightBuilder.Field("name") //高亮域
                    .preTags("<span style='color:red'>") //高亮样式的前缀
                    .postTags("</span>");//高亮样式的后缀
            nativeSearchQueryBuilder.withHighlightFields(field);

            //6.品牌聚合(分组)查询
            String skuBrand = "skuBrand";
            nativeSearchQueryBuilder.addAggregation(AggregationBuilders.terms(skuBrand).field("brandName"));

            //7. 规格聚合(分组)查询
            String skuSpec = "skuSpec";

            nativeSearchQueryBuilder.addAggregation(
                    AggregationBuilders.terms(skuSpec).field("spec.keyword"));

            //8 排序
            if (StringUtils.isNotEmpty(searchMap.get("sortField"))&&
                    StringUtils.isNotEmpty(searchMap.get("sortRule"))){
                if("ASC".equals(searchMap.get("sortRule"))){
                    //升序
                    nativeSearchQueryBuilder.withSort(SortBuilders.fieldSort((searchMap.get("sortField"))).order(SortOrder.ASC));
                }else {
                    //降序
                    nativeSearchQueryBuilder.withSort(SortBuilders.fieldSort((searchMap.get("sortField"))).order(SortOrder.DESC));
                }

            }
            //9/开启分页查询
            String pageNum = searchMap.get("pageNum"); //当前页
            String pageSize = searchMap.get("pageSize"); //每页显示多少条

            if (StringUtils.isEmpty(pageNum)){
                pageNum ="1";
            }
            if (StringUtils.isEmpty(pageSize)){
                pageSize="30";
            }
            nativeSearchQueryBuilder.withPageable(PageRequest.of(
                    Integer.parseInt(pageNum)-1,Integer.parseInt(pageSize)));


            //

            //10:执行查询，返回结果对象
            AggregatedPage<SkuInfo> aggregatedPage  = esTemplate.queryForPage(nativeSearchQueryBuilder.build(),
                    SkuInfo.class, new SearchResultMapper() {
                        @Override
                        public <T> AggregatedPage<T> mapResults(SearchResponse searchResponse, Class<T> aClass, Pageable pageable) {

                            List<T> list = new ArrayList<>();
                            SearchHits hits = searchResponse.getHits();

                            if (null != hits) {
                                for (SearchHit hit : hits) {
                                    SkuInfo skuInfo = JSON.parseObject(hit.getSourceAsString(), SkuInfo.class);


                                    Map<String, HighlightField> highlightFields = hit.getHighlightFields();
                                    if (highlightFields != null && highlightFields.size()>0){
                                        //替换数据
                                        skuInfo.setName(highlightFields.get("name").getFragments()[0].toString());
                                    }
                                    list.add((T) skuInfo);

                                }
                            }

                            return new AggregatedPageImpl<T>(list, pageable, hits.getTotalHits(),searchResponse.getAggregations());
                        }
                    });

            //11.总条数
            resultMap.put("total",aggregatedPage.getTotalElements());

            //12.总页数
            resultMap.put("totalPages",aggregatedPage.getTotalPages());

            //13.查询结果集合
            resultMap.put("rows",aggregatedPage.getContent());

            //14. 获取品牌聚合结果
            StringTerms brandTerms = (StringTerms) aggregatedPage.getAggregation(skuBrand);

            List<String> brandList = brandTerms.getBuckets().stream().map(bucket ->
                bucket.getKeyAsString()).collect(Collectors.toList());
            resultMap.put("brandList", brandList);

            //15. 获取规格聚合结果
            StringTerms specTerms  = (StringTerms) aggregatedPage.getAggregation(skuSpec);
            List<String> specList  = specTerms .getBuckets().stream().map(bucket -> bucket.getKeyAsString()).collect(Collectors.toList());
            resultMap.put("specList",specList(specList));

            //当前页
            resultMap.put("pageNum",pageNum);


            return resultMap;
        }
        return null;
    }

    public Map<String, Set<String>> specList(List<String> specList){
        Map<String, Set<String>> specMap = new HashMap<>();
        if (null != specList && specList.size() >0 ){
            for (String spec : specList){
                Map<String, String> map = JSON.parseObject(spec, Map.class);
                Set<Map.Entry<String, String>> entries = map.entrySet();
                for (Map.Entry<String, String> entry : entries) {
                    String key = entry.getKey();
                    String value = entry.getValue();

                    Set<String> specValues  = specMap.get(key);

                    if ( null == specValues){
                        specValues = new HashSet<>();
                    }
                    specValues.add(value);
                    specMap.put(key, specValues);
                }

            }
        }
        return specMap;
    }
}
